When a carbon atom shares an electron pair with another atom (typically H, C, S, N, or O), the sharing is unequal, in favor of the more electronegative atom. The order of increasing electronegativity is _________________.
A.
H < O < S < N < C
B.
O < C < S < N < H
C.
H < C < S < N < O
D.
H < C < S < O < C
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【单选题】Which one is not included in the water pollution purification materials?
【判断题】In the biological treatment of wastewater, the functions of protozoa and micro-metazoa are mainly embodied in indication, purification, flocculation and sedimentation.
【单选题】The gel below illustrates the purification of the RecA protein from E. coli. This gel was loaded from the top. Which statement BEST describes how proteins “run” in an SDS gel?
A.
The proteins are separated primarily by molecular weight—the largest MW proteins are on the bottom, and the smallest are on the top.
B.
The proteins are separated primarily by molecular weight—the smallest MW proteins are on the bottom, and the largest are on the top.
C.
The proteins are separated primarily by charge—the protein with the smallest pI is on the top, and the protein with the largest pI is on the bottom.
D.
The proteins are separated primarily by charge—the protein with the largest pI is on the top, and the protein with the smallest pI is on the bottom.
E.
The proteins are separated primarily by their propensity to precipitate—as electrophoresis progresses, the heat generated by the current denatures proteins faster or slower. The slowest to denature is on the bottom, and the fastest to denature is on the top.